Volume 9

iTHEMS Weekly News Letter

Seminar Report

iTHEMS Colloquium was held on June 7

2018-06-11

Prof. Yasumasa Nishiura gave a lecture at iTHEMS Colloquium which was taken place June 7th. His lecture was entitled "On the interplay between intrinsic and extrinsic instabilities of spatially localized patterns" and various patterns emerge from rather simple sets of differential equations were introduced. According to the lecture, spatially localized dissipative structures are observed in various fields, such as neural signaling, chemical reactions, discharge patterns, granular materials, vegetated landscapes, binary convection and block copolymer nanoparticles. Now, while these patterns are much simpler than single living cells, yet they seem to inherit several characteristic "living state" features, such as generation of new patterns, self-replication, switching to new dynamics via collisions and adaptive morphological changes to environments. Prof. Nishiura explained that these behaviors stem from an interplay between the intrinsic instability of each localized pattern and the strength of external signals. The global geometric interrelation amongst all relevant solution branches of a corresponding system with approximate unfolding parameters was explored. He argued that a global geometric structure formed by all relevant solution branches gives us much more insight rather than conventional PDE approaches. The theme of the lecture was most pertinent to iTHEMS colloquium and the audience was fascinated by the power of the mathematical insight applied to varied subjects and phenomena.

Upcoming Events

Seminar

Kenji Fukaya thumbnail

Supported by iTHEMS

Relative and equivariant Lagrangian Floer homology and Atiyah-Floer conjecture

June 19 (Tue) at 14:30 - 16:00, 2018

Kenji Fukaya (Senior Visiting Scientist, iTHEMS / Permanent Member, Simons Center for Geometry and Physics, Stony Brook University, New York, USA)

Atiyah-Floer conjecture concerns a relationship between Floer homology in Gauge theory and Lagrangian Floer homology. One of its difficulty is that the symplectic manifold on which we consider Lagrangian Floer homology is in general singular. In this talk I will explain that, by using relative and equivariant version of Lagrangian Floer homology, we can resolve this problem and can at least state the conjecture as rigorous mathematical conjecture.

Supported by RIKEN iTHEMS and Tuesday Seminar on Topology (Graduate School of Mathematical Sciences, The University of Tokyo).

Venue: Room 056, Graduate School of Mathematical Sciences, The University of Tokyo

Event Official Language: Japanese

Math Lecture

Introduction to Public-Key Cryptography

Introduction to Public-Key Cryptography (5th)

June 21 (Thu) at 10:30 - 12:00, 2018

Eren Mehmet Kıral (Visiting Researcher, RIKEN Center for Advanced Intelligence Project (AIP))

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: English

Math Lecture

Yosuke Kubota thumbnail

Theory of Operator Algebras

Theory of Operator Algebras (2nd)

June 21 (Thu) at 15:30 - 17:00, 2018

Yosuke Kubota (Research Scientist, iTHEMS)

Please note that the date and time of the 2nd lecture has been changed from May 21 10:30 to June 21 15:30.

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: English

Math Lecture

Computational Algebraic Statistics and its Applications

June 26 (Tue) at 10:00 - 16:30, 2018

Satoshi Aoki (Professor, Department of Mathematics, Kobe University)

Lecture 1 (10:00-11:30)
An introduction of Groebner bases of polynomial rings

Lecture 2 (13:00-14:30)
Groebner bases theory in design of experiments

Lecture 3 (15:00-16:30)
Groebner bases theory in sampling problems of contingency tables

This introductory lecture is about statistical theory from the point of view of the computational algebraic statistics, in particular the applications of Groebner bases. The statistical theory is a fundamental tool in natural science, social science and humanities, and the Groebner basis is a topic related to multi-variable polynomials. The Lecture will start from an introduction to the Groebner basis which would have wide applications in mathematics, physics, biology, chemistry, engineering, information science and computer science. Therefore, we welcome scientists in any field who are interested in this subject.

The event official language is Japanese (slides and writing are in English).

Venue: #535-537, 5F, Main Research Building, RIKEN

Event Official Language: Japanese

Colloquium

iTHEMS Colloquium

Systems Biology of Cellular Rhythms

July 2 (Mon) at 15:00 - 16:30, 2018

Albert Goldbeter (Professor, Unit of Theoretical Chronobiology, Faculty of Sciences, Université Libre de Bruxelles, Belgium)

Rhythmic phenomena occur at all levels of biological organization, with periods ranging from milliseconds to years. Among biological rhythms, circadian clocks, of a period close to 24h, play a key role as they allow the adaptation of living organisms to the alternation of day and night. Biological rhythms represent a phenomenon of temporal self-organization in the form of sustained oscillations of the limit cycle type. Mathematical models show how the emergent property of oscillatory behavior arises from molecular interactions in cellular regulatory networks, which explains why cellular rhythms represent a major research topic in systems biology. After providing an introduction to biological rhythms and their modeling, I will focus on mathematical models for two major examples of rhythmic behavior at the cellular level : the circadian clock and the cell cycle. The coupling of these rhythms allows for their synchronization and for the occurrence of more complex patterns of oscillatory behavior. I will discuss the reasons why models for cellular rhythms tend to become more complex, upon incorporating new experimental observations. The case of cellular rhythms allows us to compare the merits of simple versus complex models for the dynamics of biological systems.

Venue: Suzuki Umetaro Hall, 1F Bioscience Building, RIKEN

Broadcast: #305-2, Computational Science Research Building, R-CCS, Kobe Campus, RIKEN / SUURI-COOL (Kyoto), #204-205, 2F Maskawa Building for Education and Research, North Campus, Kyoto University / 2F Seminar Room, AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English

Workshop

Maskawa Building for Education and Research venue photo

Co-hosted by iTHEMSSUURI-COOL (Kyoto)

iCeMS-iTHEMS Joint Workshop on Interdisciplinary Biology

July 4 (Wed) at 10:00 - 16:30, 2018

This is the first joint workshop between iCeMS (Kyoto Univ.) and iTHEMS (RIKEN). The WS is co-hosted by KUIAS (Kyoto Univ.), iTHEMS (RIKEN) and MACS Program (Kyoto Univ.). By exploring the forefront of experimental and mathematical biology, this workshop aims to stimulate novel research directions in these areas and strengthen the connection between Kyoto Univ. and RIKEN. Those who plan to attend the "get-together", please register before June 22 (Fri.) noon.

Co-hosted by
Kyoto University Institute for Advanced Study (KUIAS), Kyoto Univ.
Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN
MACS Program (MACS), Kyoto Univ.

Venue: #201, Maskawa Building for Education and Research, North Campus, Kyoto University

Event Official Language: English

Math Lecture

Yosuke Kubota thumbnail

Theory of Operator Algebras

Theory of Operator Algebras (3rd)

July 12 (Thu) at 15:30 - 17:00, 2018

Yosuke Kubota (Research Scientist, iTHEMS)

Venue: Seminar Room #160, 1F Main Research Building, RIKEN

Event Official Language: English

Colloquium

iTHEMS Colloquium

Bell's Theorem, Entanglement, Quantum Teleportation and All That

July 19 (Thu) at 16:00 - 17:30, 2018

Anthony James Leggett (Professor, University of Illinois at Urbana-Champaign, USA)

iTHEMS-CEMS Joint Colloquium.

Professor Leggett is widely recognized as a world leader in the theory of low-temperature physics, and his pioneering work on superfluidity was recognized by the 2003 Nobel Prize in Physics.

Abstract:
One of the most surprising aspects of quantum mechanics is that under certain circumstances it does not allow individual physical systems, even when isolated, to possess properties in their own right. This feature, first clearly appreciated by John Bell in 1964, has over the last half-century been tested experimentally and found (in most people's opinion) to be spectacularly confirmed. More recently it has been realized that it permits various operations which are classically impossible, such as "teleportation" and secure-in-principle cryptography.
This talk is a very basic introduction to the subject, which requires only elementary quantum mechanics.

Venue: Okochi Hall, 1F Laser Science Laboratory, RIKEN

Broadcast: #311, Computational Science Research Building, R-CCS, Kobe Campus, RIKEN / SUURI-COOL (Kyoto), #204-205, 2F Maskawa Building for Education and Research, North Campus, Kyoto University / 2F Seminar Room, AIMR Main Building, Advanced Institute for Materials Research (AIMR), Tohoku University

Event Official Language: English

Conference

Supported by iTHEMS

International Symposium on Quantum Fluids and Solids (QFS)

July 25 (Wed) - 31 (Tue), 2018

The International Symposium on Quantum Fluids and Solids (QFS) will be held at Ito International Research Center (IIRC) on Hongo campus of the University of Tokyo, Japan, from July 25 through 31, 2018. One of the sponsors of this conference is iTHEMS.

The QFS series started forty-three years ago making it one of the oldest series of international conferences in the field of low temperature physics. It has historically been focusing on physics of liquid and solid helium and hydrogen. But in this century its scope is expanding widely from laser cooled cold atoms to topological matters. At QFS2018 in Tokyo, this trend will be continued and with even more interdisciplinary aspects emphasized between the traditional subjects and those in broader physical systems.

Venue: Ito International Research Center (IIRC), Hongo Campus, The University of Tokyo

Event Official Language: English

Person of the Week

Ade Irma Suriajaya thumbnail

Self-introduction: Ade Irma Suriajaya

2018-06-11

Hello! My name is Ade Irma Suriajaya but people usually call me simply Chacha. I am originally from Indonesia and I made the nickname from my Chinese name, another name I have which is not officially registered, except in my college documents. I went to Nanjing University of Aeronautics and Astronautics in China after graduating from high school in Indonesia to pursue undergraduate study in Aeronautical Engineering. I was attracted to Mathematics in just my first month, thanks to the very interesting Calculus class I had back then.

I got my first opportunity to study pure mathematics two years later when I got a scholarship for a one-year academic exchange program in Nagoya University in Japan. However I could not do that without sufficient Japanese proficiency, but I was finally able to take basic pure mathematics courses (designed for third semester students) the next semester, and I made up my mind to change my major to Mathematics. Nevertheless, there was no pure mathematics major in my home university in China and during the last year of my undergraduate study, I was taking only mathematics classes offered by the applied mathematics major (the official name was not Applied Mathematics).

I managed to come back to Japan the year after, soon after I got my bachelor degree to finally, officially start my path in mathematics. This year marks the seventh year I work in analytic number theory.

My main research interest is the analytic properties of zeta functions and L-functions such as, location of zeros and distribution of values of these special functions. I am very delighted to be a part of iTHEMS where I get to easily communicate with other theoretical scientists. I used to be more into Physics and Chemistry when I was in middle school and high school and I am very happy to get to know lots of new things, not only in those fields, but also in other fields of science. Furthermore, I am mostly excited to be able to collaborate with other scientists and hopefully apply my (still very very limited) knowledge in mathematics and also probably, the more limited knowledge in engineering or applied mathematics.

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